Land recontouring and stream diversion require careful management to avoid or mitigate impacts on the environment.
Earthworks & control of stormwater
You need to limit the likelihood of sediment run-off to streams. Minor earthworks are allowed without a resource consent.
What you need to ensure
You won't need a resource consent for stormwater run-oﬀ from earthworks if:
- You are working in a small area (less than one hectare).
- The volume of disturbed material is less than 3000 cubic metres.
- The area is stabilised as soon as possible after the earthworks have been completed.
- The run-off does not contain levels of sediment that would have a signiﬁcant eﬀect on water quality.
- There are unlikely to be signiﬁcant adverse effects on the quality of water or wetlands.
If earthworks extend over a larger area (between one hectare and eight hectares), you don’t require a resource consent as long as:
- The volume is less than 24,000 cubic metres.
- Soil stabilisation is undertaken as soon as practicable.
- You meet the other requirements listed above.
- You are not doing the work between 1 May and 31 October.
You must meet all of these requirements. Otherwise, you will need a resource consent.
The Council has produced a document of guidelines and advice on controlling stormwater run-off from earthworks.
You should also check whether your District Council has any requirements.
Realigning, diverting or piping a stream
Generally you will require a resource consent to realign, move or pipe a stream, particularly if a wetland is affected. Realignment, diversion or piping a stream is prohibited within the Stony River catchment.
What you need to ensure
A resource consent will be required unless you can meet all of these requirements:
- The upstream catchment area is less than 25 hectares.
- The length of stream to be changed is less than 200m long (including any sections that have previously been realigned since 1998).
- The drainage channel is less than 4 square metres in cross-sectional area.
- There are no eﬀects on neighbouring properties or restrictions on anyone else's water supply or resource consent.
- There are no signiﬁcant environmental eﬀects, including scouring or erosion, restriction of ﬁsh passage, or eﬀect on aquatic life or habitat.
- The Council is informed that you intend to do the work at least two working days before you start work.
Mitigation and a ﬁnancial contribution will be required to offset any loss of stream habitat.
Other activities in or near streams may require a resource consent. If you are in any doubt refer to the Regional Freshwater Plan or contact the Council’s consents staﬀ.